lib/snprintf.c

   1 /* Formatted output to strings.
   2    Copyright (C) 2004, 2006-2024 Free Software Foundation, Inc.
   3
   4    This file is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation; either version 2.1 of the
   7    License, or (at your option) any later version.
   8
   9    This file is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 #include <stdio.h>
  21
  22 #include <errno.h>
  23 #include <limits.h>
  24 #include <stdarg.h>
  25 #include <stdint.h>
  26
  27 int
  28 snprintf (char *str, size_t size, const char *format, ...)
  29 {
  30   va_list args;
  31   ptrdiff_t ret;
  32
  33   va_start (args, format);
  34   ret = vzsnprintf (str, size, format, args);
  35   va_end (args);
  36
  37 #if PTRDIFF_MAX > INT_MAX
  38   if (ret > INT_MAX)
  39     {
  40       errno = EOVERFLOW;
  41       return -1;
  42     }
  43 #endif
  44
  45   return ret;
  46 }